De novo pathogenic variant in TUBB2A presenting with arthrogryposis multiplex congenita, brain abnormalities, and severe developmental delay

Am J Med Genet A. 2017 Oct;173(10):2725-2730. doi: 10.1002/ajmg.a.38352. Epub 2017 Aug 25.


Disorders of brain formation can occur from pathogenic variants in various alpha and beta tubulin genes. Heterozygous pathogenic variants in the beta tubulin isotype A gene, TUBB2A, have been recently implicated in brain malformations, seizures, and developmental delay. Limited information is known regarding the phenotypic spectrum associated with pathogenic variants in this gene given the rarity of the condition. We report the sixth individual with a de novo heterozygous TUBB2A pathogenic variant, who presented with a severe neurological phenotype along with unique features of arthrogryposis multiplex congenita, optic nerve hypoplasia, dysmorphic facial features, and vocal cord paralysis, thereby expanding the gene-related phenotype.

Keywords: TUBB2A; contractures; cortical malformation; optic nerve hypoplasia; tubulinopathy.

Publication types

  • Case Reports

MeSH terms

  • Arthrogryposis / complications
  • Arthrogryposis / genetics*
  • Arthrogryposis / pathology
  • Brain Diseases / complications
  • Brain Diseases / genetics*
  • Brain Diseases / pathology
  • Child, Preschool
  • Developmental Disabilities / complications
  • Developmental Disabilities / genetics*
  • Developmental Disabilities / pathology
  • Fatal Outcome
  • Genetic Predisposition to Disease
  • Humans
  • Male
  • Mutation, Missense*
  • Tubulin / genetics*


  • TUBB2A protein, human
  • Tubulin